To be honest, I hadn't heard of any of these static hosting providers. I've used S3/Google Cloud Storage with Cloudflare to get SSL. For low traffic sites this setup is effectively free and very easy to set up.
Netlify CTO here.
It's great that a combination of those services works for you. Our initial tier is completely free, $0. No costs per traffic nor storage, unlike S3.
Please, feel free to send questions and I'll be happy to answer them.